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One L7 with a kx1200.1 amp will it blow?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=53771
Printed Date: May 16, 2024 at 6:53 PM


Topic: One L7 with a kx1200.1 amp will it blow?

Posted By: glowstickninja
Subject: One L7 with a kx1200.1 amp will it blow?
Date Posted: April 12, 2005 at 11:13 AM

So if i were to put a kicker kx1200.1 amp to one L7 12" sub, at one ohm, will it blow?



Replies:

Posted By: jstruckman
Date Posted: April 12, 2005 at 12:06 PM
Not if you know how to properly set the gains.

Jazzy

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Posted By: DYohn
Date Posted: April 12, 2005 at 12:13 PM
Which are you concerned with blowing, the amp or the speaker?  What kind of enclosure is the speaker in?

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Posted By: glowstickninja
Date Posted: April 12, 2005 at 3:34 PM
I am concerned the sub will blow, but i dont want to resort to 4 ohms until i get my other sub you know........the speaker could be in either a sealed or a vented enclosure, but most likely the vented.  3.25 ft^3 tuned to 38hz. 




Posted By: kfr01
Date Posted: April 12, 2005 at 3:39 PM
I already answered this question in your other thread. Why ask twice?

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New Project: 2003 Pathfinder




Posted By: bumpn_neon
Date Posted: April 12, 2005 at 8:32 PM
If u dont set the gains real high and if u get a good box that system would kick a**!!

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-1 12" Alpine type S
-12" Plexiglass box
-500.2 rockford amp.
-8 gauge monster cable
-Alpine CD player
-Hits 130.5 dbs




Posted By: kfr01
Date Posted: April 12, 2005 at 10:11 PM
Sigh. Like we said in the previous thread, power handling is greatly reduced in large ported enclosures. Kicker only recommends what, 700w in that enclosure?

Anyway, as long as you aren't off your rocker with the volume control and learn how to set gain correctly you should be fine. However, statements like: "but i dont want to resort to 4 ohms until i get my other sub you know" make me guess that you'll neither have any self control nor set your gains correctly.

I recommend you either:
1) Build a small sealed box so you can hammer the volume knob to your heart's content

2) Run at 4ohms (gasp!)

3) Wait until you buy your other subwoofer

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New Project: 2003 Pathfinder




Posted By: glowstickninja
Date Posted: April 12, 2005 at 10:35 PM
Yaada, i know what you mean lol, we are having almost the same conversation on the other thread sorry.... so if i was to get a multimeter and monitor the gain while setting it, do you know a formula at which i should set the gain, i always heard ear is the best, but with this set up i could blow it easily.




Posted By: kfr01
Date Posted: April 12, 2005 at 10:47 PM
You're missing the point. Those people who posted about the gain are also missing the point.

Power handling, regardless of the gain, is greatly reduced when running a large ported enclosure. Even if you properly set your gain you can run the sub in that enclosure too hard. (especially tuned at a too-high 38hz).

Setting gain by ear is OK when you know what to listen for and don't plan to abuse your system with the volume knob. Most people buying 1200w amplifiers and L7s and insisting on running at 1 ohm ALWAYS plan to abuse the volume knob. ;-)

Seriously, I repeat:
"I recommend you either:
1) Build a small sealed box so you can hammer the volume knob to your heart's content

2) Run at 4ohms (gasp!)

3) Wait until you buy your other subwoofer"

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New Project: 2003 Pathfinder




Posted By: glowstickninja
Date Posted: April 12, 2005 at 11:07 PM
what are the chances my car is going to run at full 14.5v cuz thats what it is rated at 1200X1 at 1ohm and 14.5v. Kicker says that if the amp is placed at 12.5v that the amp only puts out 1050X1 which is quite a bit lower. take that into account and i set my gain low, easy on the volume knob (and i really will be) should be good right, and if i were to make a sealed enclosure. or if i am easy on the knob the vented one still. My vehicle is a 1998 jetta 4cyl.




Posted By: kfr01
Date Posted: April 12, 2005 at 11:26 PM
I would stick with the sealed enclosure.

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New Project: 2003 Pathfinder




Posted By: soundmasta
Date Posted: April 13, 2005 at 7:23 AM

i've done a few systems and some setups on the display at the shop i work at that ran a dual two ohm L7 on a 1200.1.  from what i saw, that sub handles anything that amp has at one ohm. never seen one blow, unless it's been plugged into the wall for a while. 

as for the box, we almost always put those things in ported enclosures, and it's never been a problem with the 1200.1.



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Posted By: audiobass10
Date Posted: April 13, 2005 at 1:17 PM
From the posts i've read, I would strongly suggest running the amp at 4ohms. krf01 brings up a good point about power handling decreasing with a large ported enclosure. Thermal handling is stated FOR A REASON and it's never a great idea to cross the limits by a large amount of power for long periods of time (daily driving). If you run your subs hard and like to play it at loud volumes, you really shouldn't send that much to the L7 period. Let's not forget that L7's have a repuation for being an unreliable sub as well..

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Dave

Pioneer Premier DEH-P660
15" Kicker CVR
Profile AP1000M
It's Loud




Posted By: kfr01
Date Posted: April 13, 2005 at 2:18 PM
Not only are power handling guidelines posted for a reason, but you usually have next to nill in SPL to gain by pushing a subwoofer to its thermal or excursion max...

i.e. it isn't like Kicker is just being the "fun police" by listing reduced power handling numbers for large ported enclosures ;-)

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New Project: 2003 Pathfinder




Posted By: glowstickninja
Date Posted: April 14, 2005 at 5:17 PM
Good news yall, since i thought about it and decisde i probably couldnt control my itchy volume finger, i decided to swap for the dual 4 ohm sub. this way i can wire it in parralell and then still have room for exansion into another sub and run the amp at 1 ohm. and i wont have to worry about blowing it so much.





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